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Lawson 8.x did not accept service order invoices using their MA540 interface. I’m glad to say that Lawson 9.0 now accepts these documents. Here are a few tips for you:

The HANDLING CODE (record #37) typically must have the handling code of either “M” for match or “S” for service. A purchase order may have multiple lines. These lines may include a combination of inventory and service items. The handling code may be “S” only if all the lines sent with the invoice are service items. If there is at least one non-service item, then you must submit the handling code as “M”. Lawson will reject the invoice if you send a handling code of “S” for an invoice that includes a non-service line item.

If left blank, the handling code defaults from the vendor, process level, or match company.
The invoice will enter Lawson with a status of “UNREALESED”. It will remain unreleased until the mass release process is run (job #126). Some companies run this job on a daily basis.

If you need any help, let me know. I’ve been sending MA540 files from DocEdge to Lawson for years. I’d be glad to help.